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is adjourned. >> welcome. we are here doing our building san francisco tour. we're going to have a very interesting tour of elevators in sanford cisco. we have all gotten into an elevator, the doors have closed, and it has carried us to our destination. have you ever wondered how elevators were -- work? we check out the need outside the elevator using current technology and we learn about the latest destination elevated technology all here in san francisco. we will also visit the machinery where all the behind- the-scenes gears control these incredible machines. we are very fortunate today to have an expert with those who is going to walk us are around elevators in san francisco. can you tell us about the history of elevators in san francisco? the measure -- >> sure. the history of elevator technology evolves with the city. first elevators were installed for moving materials in the 1860's. in the 1870's, the first passenger elevator was installed, and that allowed building heights to go up to about seven floors. starting in the 18 eighties, 1890's, the first electric elevators were inst
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